Basement Finishing Costs in Ontario (2025 Update)

Thinking about transforming your basement into usable living space?

As of 2025, finishing a basement in Ontario typically runs between $60 to $80 per square foot for a mid-level finish, depending on location, design features, and finish quality. Level Up Basement

Here’s a breakdown of what those numbers mean in real terms:

• For a 1,000 sq ft basement, expect somewhere in the ballpark of $60,000 to $80,000 for a solid, well-finished space. Level Up Basement

• If you want to include extras like a bathroom, wet bar, or separate entry for a legal suite, costs can climb toward $90 to $120+ per square foot. 360Lending+2Newfore+2

• A more basic finish (open layout, standard flooring, minimal partition walls) might be done at a lower range, but planning for $50–$60/sq ft gives you a safer buffer. Reno Duck+1

What Drives the Cost?

Several key factors influence how much your project ends up costing:

Factor	Impact	Notes
Size & layout	Bigger basements cost more overall, though per-sqft cost may drop slightly	More walls, transitions, and complexity = more labor and materials
Finishes & fixtures	Premium flooring, built-ins, upscale lighting, custom cabinetry raise costs	A tile selection vs vinyl, or quartz vs laminate counters, make a big difference
Plumbing & bathrooms	Adding a 3-piece (sink, toilet, shower) can add $12,000–$20,000+	You may need slab cutting and trenching for plumbing lines Bacvar Building Inc+3Senso Design+3Level Up Basement+3
Egress windows / exits	Required for bedrooms or rentals to meet code	Installing or enlarging window wells, cutting through foundation walls is costly
Waterproofing & foundation prep	Crucial for long-term durability	If there is moisture, cracks, or leaks, you’ll need to address them first
Permits & inspections	Municipal cost and compliance	Always factor in permit fees and municipal approvals
Mechanical, electrical & HVAC	Ventilation, ductwork, wiring, lighting	Especially if existing systems have to be upgraded or extended
Ceiling height & structural modifications	If you need to dig out or reinforce parts or raise a ceiling	Very costly structural work

Sample Cost Scenarios (2025, Ontario / GTA area)

Basement Size	Basic Finish Estimate	Mid-Range Finish Estimate	High-End / Legal Suite Estimate
500 sq ft	~$42,000	~55,000-65,000	~$80,000+
1,000 sq ft	~$60,000	~$70,000–$85,000	~$105,000–$120,000+
1,500 sq ft	~$90,000	~$105,000–$125,000	~$135,000+

(These are estimates. Your project might be more or less depending on the factors above.)